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Image Quiz: Dermatology—The case of the crusty cat

This 8-year-old neutered male domestic shorthaired cat has a two-month history of pruritic generalized crusting dermatitis that has been poorly responsive to antibiotics and bathing (Figure 1). Six weeks ago, a mediastinal thymoma was surgically removed; the crusting dermatitis preceded the surgery and persisted unchanged postoperatively.

Figure 1

Cytologic examination is performed on samples of exudate under pinnal crusts (Figure 2) and on moist crusts from the ventral trunk (Figure 3).